My favorite time waster I have played this game constantly since I found it soon after its release. The developer made some significant UI changes but then was receptive to our requests to make the old interface available as an option. It's now back to its position at the top of my favorites list.

One of the Best Ken Ken Apps I play all the time on this app. Puzzles range from 4 x 4 to 9 x 9. There are an unlimited number of puzzles that can be created. One problem is that all puzzles required all four math operations. Other apps have the option of choosing which operations to use, but those apps cost more.

Don't download the update! I'm so bummed, this was my favorite game and the app was awesome! Unfortunately, I just downloaded the updated version and not only can I not change the screen orientation, but I can't play at all--the number pad isn't there. Super sad, I shouldn't have tried to update. I even uninstalled and reinstalled as someone recommended with no luck.

Used to love this game The new swipe interface is absolutely dreadful. I used to play dozens of times a day and now am uninstalling. Too bad you ruined the only game I had installed on my phone

Well Done! Well thought out with all the game-in-progress options that one could ask for. Thanks for this little gem! [Added] The latest v2.12 update fixed the Back key FC problem. Thanks!

Love the game but new input is impossible I've loved this app since I first found it, but the new input method is not at all user friendly, especially on larger size puzzles with squares right on the edge of the screen. Original app would be a 5/5 for me, but only a 3/5 now because it's simply too hard to use. If the new input is reverted or at least made optional I'll give 5/5 again